How to make a puzzle

terrible puzzle lmao
ok well it was in one of my games, also, its black to move

[Event "?"]
[Site "Chess.com iPhone"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]
1. e4 e5 2. Bc4 Nc6 3. Qf3 3... Qe7 (3... Nb4 4. Qxf7# ) {1-0}
auto-queen promoters must die.